For cabbage is an important disease in the cultivation of cabbage. Once the disease occurs, it can cause the decrease in cabbage, and the output has decreased significantly, which is not conducive to the cabbage of the cabbage. Therefore, understanding and mastering the laws and prevention methods of cabbage blight is of great significance to increase the production of cabbage, reduce losses, and increase people’s income.
1. Symptoms: Forciby blight mainly occurs in the middle and late stages of growth, and the onset of the heart is severe. The rotten parts change from dark brown water stains to dark brown, and the surface is dry. No mold layer. The rot of the leaf ball is mainly limited to the surface leaves. After the rot spreads the leaf ball, the inside begins to be soft, but the stench without soft rot.
Second, rules: Invasion of the germs with the disease in the soil, you can also become the first source of invasion of the field in the field with the seed belt bacteria. The germs invaded from natural holes such as leaf margin water holes. After the onset of the disease, bacteria spread through the spread of bacteria, watering, watering, and agricultural operations. Warm and humidity is conducive to the onset. Leaf nodular dew and leaf margin spitting water is an important condition for germs to move, infection and spread. During the planting of the spring and autumn, it is warm and rainy, or foggy, large temperature difference between day and night, long exposure time, etc. It is conducive to the onset.
3. Prevention and treatment methods: 1. After harvesting, timely and thoroughly clear the diseased leaves, concentrate the fertilizer of fertilizer after the pile of high temperature fermentation sterilization. 2. Rotation of severe diseases and non -Cross flowers. 3. Appropriately control watering after the onset, improve watering methods, and prohibit large water irrigation. Protective land planting should be strengthened and dew to reduce leaf surface. 4. Disease -free soil nursery and seed treatment: Dry seeds are treated with 72 ° C dry heat for 3 days. It can also be mixed with 47%spring thundericin · chlorine oxygenic powder with a weight of 0.3%of the seed weight, or washed the buds to sow with a 40%Forma L50 double liquid planting for 1.5 hours. 5. In the early stages of the onset, remove the diseased plant and control the pharmaceutical prevention, you can choose 47%chunromycin · copper oxygen chloride wettable powder 600-800 times liquid, 58.3%hydroxide dried suspension 1 000 times liquid, 25%25% Monons 500 times liquid, 25%chilidazole wettable powder 600 times liquid, 72%agricultural rinseein wettable powder 4000 times liquid, neoamycin 5000 times liquid spray, 10 to L5 days 1 1 day 1 Second, the disease is controlled 2 to 3 times.